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Building or repairing an AR-15 pistol lower means you need a buffer system that just works, and this TacFire kit hands you everything in one box. It centers on a mil-spec pistol receiver extension wrapped with a foam insert, paired with a standard end plate, castle nut, carbine-length spring, and a 3 oz buffer. Whether you're replacing a beat-up assembly or starting a fresh pistol project, this covers the back half of your lower in a single purchase.
A pistol buffer tube is smooth on the outside with no bottom rail or position notches, which is the main thing that sets it apart from a carbine tube. That clean profile is what lets the foam sleeve slide on and gives you a tube meant to run bare or wear a brace instead of a shouldered stock. Mechanically the bore is the same as a carbine tube, so the included carbine-length buffer and spring drop right in and cycle the bolt carrier the way you'd expect. The kit measures roughly 8 inches in overall length and carries a black finish that matches most AR furniture.
Installation is straightforward for anyone who has assembled an AR lower before. The tube threads into the rear of the receiver, the end plate and castle nut lock it down, and the buffer and spring load in from the front. A quick tip from the bench: take your time seating the takedown detent and spring before you snug the castle nut, since that's the step that trips up first-time builders. Once it's staked or thread-locked, you've got a solid foundation for the rest of your pistol build.
TacFire has been putting out AR accessories and parts since 2010, and this kit fits their reputation for giving budget-minded builders a functional, no-nonsense option. It's a practical pick for replacing a damaged system or fleshing out a new lower without overspending on the buffer assembly.
The kit includes a mil-spec pistol buffer tube with a foam insert, a 3 oz buffer, a carbine-length buffer spring, a standard end plate, and a castle nut. That's everything you need for the buffer system on an AR-15 pistol lower. You'll still supply your own lower receiver and any brace if you plan to run one.
A pistol buffer tube is smooth on the outside with no bottom rail or position notches, so it isn't set up to hold a collapsible buttstock. The bore that houses the buffer and spring is the same as a carbine tube, which is why this kit's carbine-length buffer and spring cycle the action normally. The foam insert on this tube is meant for a bare setup or for use with a brace.
Yes, the tube threads into a standard mil-spec AR-15 lower receiver just like any carbine receiver extension. The threading and receiver end are functionally the same across mil-spec lowers, so it screws right in. Just double-check that your lower is mil-spec rather than commercial spec if you plan to add a brace later.
It works well for both. Builders grab it to start a fresh AR-15 pistol lower, and others use it to swap out a damaged or worn buffer assembly. It gives you a complete, functional foundation without having to piece together the buffer, spring, and hardware separately.
| UPC | 811261022010 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MAR049A |
| Product Type | Buffer Assembly |
| Shipping Weight | 0.72 |
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